A river of desert dust flows over Sudan (left), over the Red Sea, and on to Saudi Arabia in this <a HREF="http://modis.gsfc.nasa.gov" target="outlink">Moderate Resolution Imaging Spectroradiometer</a> (MODIS) from the <a HREF="http://terra.nasa.gov/" target="outlink">Terra</a> satellite on June 26, 2003. At left, the green ribbon winding its way through the arid terrain is the Nile River. Sensor: Terra/MODIS. Data Start Date: 6/26/03. Data End Date: 6/26/03.